If you don't pay attention too closely, this is a fairly entertaining film. J. Carrol Naish
is fine as the Nazi spymaster. John Carradine
just wasn't sinister or psychotic enough to make his character believable, but was better than most of the rest of the cast, though John Bleifer
stood out as the slimy, double-dealing blackmailer. I thought it was pretty well directed, too.
I can see why the police arrested the male romantic lead, but if the FBI had really done their job he would have been quickly released, since he had no gun and none was recovered at the scene, had no gunfire residue on his hands (The paraffin test had been mentioned in movies of the 1930s.), and had a legitimate reason for being at the murder scene. Yet he went to trial for the murder. I don't know much about guns, but I recognized the iconic Luger pistol used by the murderer. The FBI identified the murder weapon as a Mauser. A pretty clumsy portrayal of the FBI for this marginally propagandistic spy drama.
I downloaded the 266MB 512Kb MPEG4 file. It was good enough for full screen viewing, but was better suited to a smaller area. The print from which it was made had seen better days. It had missing frames, scratches, and what looked like decay. The audio quality was Ok.